Step-by-step mechanics reveal that Usain Bolt hits the ground with a peak force of over 1000 pounds with his right, but not his left leg, in these steps from this high-speed race footage from NBC Universal Sports.
Ground forces were determined from Bolt's gait mechanics using a new method described here: jeb.biologists.org/content/early/2016/11/02/jeb.138057
Video by: Locomotor Lab at SMU